Fulltext

Comparative theoretical analysis of continuous wave laser cutting of metals at 1 and 10μm wavelength

Brügmann, Michael ; Feurer, Thomas

In: Applied Physics A, 2014, vol. 116, no. 3, p. 1353-1364

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    Titre
    • Comparative theoretical analysis of continuous wave laser cutting of metals at 1 and 10μm wavelength
    Auteur
    • Brügmann, Michael. Institute of Applied Physics, University of Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland
    • Feurer, Thomas. Institute of Applied Physics, University of Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Applied Physics A, 2014, vol. 116, no. 3, p. 1353-1364. Springer Berlin Heidelberg
    Autre version électronique
    Classification
    • Technologie, Sciences de l'ingénieur
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325637
    Summary
    We present a derivation and, based on it, an extension of a model originally proposed by V.G. Niziev to describe continuous wave laser cutting of metals. Starting from a local energy balance and by incorporating heat removal through heat conduction to the bulk material, we find a differential equation for the cutting profile. This equation is solved numerically and yields, besides the cutting profiles, the maximum cutting speed, the absorptivity profiles, and other relevant quantities. Our main goal is to demonstrate the model's capability to explain some of the experimentally observed differences between laser cutting at around 1 and 10μm wavelengths. To compare our numerical results to experimental observations, we perform simulations for exactly the same material and laser beam parameters as those used in a recent comparative experimental study. Generally, we find good agreement between theoretical and experimental results and show that the main differences between laser cutting with 1- and 10-μm beams arise from the different absorptivity profiles and absorbed intensities. Especially the latter suggests that the energy transfer, and thus the laser cutting process, is more efficient in the case of laser cutting with 1-μm beams.